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Blood is a vital fluid that circulates throughout the body, delivering oxygen and nutrients to tissues while removing waste products like carbon dioxide. Composed of plasma, red blood cells, white blood cells, and platelets, blood supports crucial functions, including immunity, clotting, and maintaining body temperature. Red blood cells carry oxygen, white blood cells fight infections, platelets help heal wounds, and plasma transports nutrients and hormones. Blood types, such as A, B, AB, and O, are determined by antigens on red blood cells. Essential for life, blo
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